Whistle and safety valve



March 13, 1928.

c. w. HILL WHISTLE AND SAFETY VALVE Filed Sept. 29. 1926 nn mm INVENTOR ATTORNEY Patented Mar. 13, 1 928.

UNITED STATES CHARLES WESLEY HILL,

, WHISTLE AND OF OAKD'ALE, TENNESSEE.

SAFETY VALVE.

Application filed September 29, 1926. Serial No. 138,461.

This invention relates to a combined safety valve and alarnnthe general objectof the in? vention being to provide means for sounding an alarm when steam, air or other pressure in a system reaches a high level or a low degree. I

A further object of the invention is to provide means for adjusting the device from the exterior thereof, v

This invention, also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a sectional view through the device.

Figure 2 is an elevation thereof.

Figure 3 is a section on line 3-8 of Figure 1.

Figure 4 is a top plan view.

Figure 5 is a section on line 5-5 of Flgure 1. i

Figure 6 is an elevation, with parts 1n section, showing a modification.

Figure 7 is a section on line 77 of Figure 6.

In these views, 1 indicates a cylinder which has its lower end closed by a cap 2 which has a threaded hole therein to receive the pipe 3 which is connected with the pressure system. The upper end of the cylinder has a threaded opening therein to receive a tubular member 4 which has a wrench receiving part 4 thereon so that it can be adjusted in the cylinder and 1ts upper end is formed with the whistle 5. A sleeve 6 snugly fits in the member 4 and th1s sleeve has one side flattened to form a passage 7 from the cylinder to the whistle 5. The sleeve also provides a guide for the piston rod 8 or the piston 9 which is normally pressed to ward the bottom of the cylinder by the spring 10 arranged in the cylinder and having one end engaging the piston and lts other end engaging a washer 11 m the top of the cylinder and which bears against the inner end of the tubular member The cylinder is provided with a pair of internal notches 12 and 13, these notches being formed sounded.

in the interior wall of v the cylinder. The notches are oi greater length iii an the width of the piston so that when the piston comes 7 opposite a notch, the two portions of the cylinder aboveand below the piston will be in communication with each other.

From the foregoing, it will be seen that by adjusting the tension of the spring through means of the member 4 to cause the pressure in the system to hold the piston between the two notches, if the pressure should fall, the spring would lower the piston and as soon as the piston came opposite the notch 12, the compressed fluid would pass from the lower part of the cylinder through the notch 12 into theupper part thereof so that some of this fluid will escape through the whistle and thus sound the alarm and warn the operator that a low pressure exists in the system. It the pressure becomes ex cessive in the system, the piston would rise until it reached the notch 14:, when the same action would occur and the alarm would be The device can be used to prevent excessive pressure in a system, such as a boiler for instance, by plugging or otherwise closing the'lower notch 12 so that thedevice will only operate whenhigh pressure raises the piston opposite the notch 13, when the exeessive pressure will escape through the whistle.

Figures 6 and 7 show a device wherein the member a" is provided with a handle 14: for turning the same to make the adjustments,

and the device is also provided with a dial 15 which is fastened to the cylinder and a finger 16 which is fastened to the member a" and cooperates with the dial. The lock nut 17, used in the other device, is omitted in this device; This device would have but ,one notch, as it is mainly intended for use in air systems for pumping up, pneumatic tires and the like. In this case, the handle would be turned to place the finger 16 at the numeral on the dial which represents the degree of pressure to 'whichthe tires are to be inflated and then the nozzle of the system is applied to the tire stem. Then as soon as the pressure in the tire reaches the degree at which the device is set, the piston will be raised so that the air will escape from the whistle, thus preventing excessive pressure in the tire and also sounding a warning that enough air has been placed in the tire.

The device can be used on railroads as a It is thought from the foregoing descrip tion that the ad antages and novel features of my invention will he readily apparent.

I desire it to he understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

W'hat I claim is A device of the class described comprising a cylinder. .1 piston therein, a threaded tubular, member passing through the top of the cylinder, a sleeve fitting snugly inthe'tubular member and having one side flattened to form a passage between itself and the member, said sleeve receiving the top portion of the piston rod, the up Jer part of the tubular member having a whistle formed therewith so that compressed fluid entering the cylinder will pass through the passage to the whistle part and sound the same, a coil spring on the rod between the piston and the inner end of the tubular member so that the adjustment of the tuhular ineniher will affect the tension of the spring, means for connecting the lower end of the cylinder with a pressure system and" the inner wall of the cylinder having a pair of notches therein, one arranged ahove the other, with each notch ofgreater length than the width of the piston.

In testimony whereof I aill'x my signature.

CHARLES ESLEY HILL. 

